From 3b7edc03821c79a0a8cd6b81346961193d48e938 Mon Sep 17 00:00:00 2001
From: Scott Nadal <scott.nadal@gmail.com>
Date: Thu, 7 Jun 2012 16:03:01 +0100
Subject: [PATCH] PPCoin: Asking for blocks when checkpoint block is not yet accepted

---
 src/checkpoints.cpp |    7 +++++--
 src/checkpoints.h   |    2 +-
 src/main.cpp        |    2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index 4560240..ac86c95 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -62,7 +62,7 @@ namespace Checkpoints
     CSyncCheckpoint checkpointMessagePending;
     CCriticalSection cs_hashSyncCheckpoint;
 
-    bool CSyncCheckpoint::ProcessSyncCheckpoint()
+    bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
     {
         if (!CheckSignature())
             return false;
@@ -71,8 +71,11 @@ namespace Checkpoints
         {
             if (!mapBlockIndex.count(hashCheckpoint))
             {
-                // TODO: we don't have this block yet, so ask for it
+                // We haven't accepted this block, keep the checkpoint as pending
                 checkpointMessagePending = *this;
+                // Ask this guy to fill in what we're missing
+                if (pfrom)
+                    pfrom->PushGetBlocks(pindexBest, hashCheckpoint);
                 return false;
             }
 
diff --git a/src/checkpoints.h b/src/checkpoints.h
index 6ef2c14..372f32b 100644
--- a/src/checkpoints.h
+++ b/src/checkpoints.h
@@ -128,7 +128,7 @@ namespace Checkpoints
             return true;
         }
 
-        bool ProcessSyncCheckpoint();
+        bool ProcessSyncCheckpoint(CNode* pfrom);
     };
 
     extern uint256 hashSyncCheckpoint;
diff --git a/src/main.cpp b/src/main.cpp
index 0dca0ae..e1bdac6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2588,7 +2588,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         Checkpoints::CSyncCheckpoint checkpoint;
         vRecv >> checkpoint;
 
-        if (checkpoint.ProcessSyncCheckpoint())
+        if (checkpoint.ProcessSyncCheckpoint(pfrom))
         {
             // Relay
             pfrom->hashCheckpointKnown = checkpoint.hashCheckpoint;
-- 
1.7.1